*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
div{
  button:nth-child(1){
    margin-left: 20px;
  }
  button{
    // width: 110px; 
    height: 40px;
    flex: 1;
    text-align: center;
    line-height:40px;
    margin-right: 20px;
  }
}